3)Total amount of A and T in DNA is 45%.Amount of Guanine will be-A)22.5% B)27.5% C)45% C)55%

4)In a DNA molecule Adenine is 31% and Guanine is 40%.What would be percentage of cytosine?A)19% B)40% C)36% D)50%

Please explain easily.

Expert's answer

2014-08-12T05:12:17-0400

1) Adenine is 30%.What would be percentage of guanine?A) 10% B)20% C)30% D)40%Answer: B. The percentage of T isequal to the percentage of A, 30%. Total percentage of total C and G is100-30-30=40, so the percentage of G is 40/2=20%.&nbsp;2) In a DNA molecule cytosine is18%.Percentage of adenine would be-A) 32% B)64% C)36% D)18%Answer: A. The percentage of G isequal to the percentage of C, 18%. Total percentage of total A and T is100-18-18=64, so the percentage of A is 64/2=32%.&nbsp;3) Total amount of A and T in DNAis 45%.Amount of Guanine will be-A)22.5% B)27.5% C)45% C)55%Answer: B. Total amount of C and Gis 100-45=55%, the amount of G is 55/2=27.5%.

4) In a DNA molecule Adenine is 31% and Guanine is 40%.What would be percentageof cytosine?A)19% B)40% C)36% D)50%Answer: B. The percentage of C is equal to the percentage of G, 40%.